The Secret of Grisly Manor

The Secret of Grisly manor is an intriguing game. The police put your grandfather on the missing persons list after he mysteriously disappeared. Suddenly, you got a letter from him. "Come now, I have to show you something!" You are in a mansion that is very strange. You will need to solve a bunch of tasks and execute a chain of actions to reveal a secret of this estate. The house is oddly empty when you get inside. Grandpa is not found. There are puzzles for you to solve.